A two-tone Beretta 92FS was used by a thug in "Bears will be Bears" after being attacked by Eddy in his Bludbad form.
Beretta 92G Elite IA
A Beretta 92G Elite IA is used by a hunter in "Let Your Hair Down". This has a torchlight attached.
Glock 17
Detectives Nick Burkhardt (Dave Giuntoli) and Hank Griffin (Russel Hornsby), as well as Captain Sean Renard (Sasha Roiz) are armed with 2nd Generation Glock 17s as their standard sidearm. This is correct since the Portland Police Bureau standardized the Glock 17 as one of the sidearms allowed for use by all of their officers. An Oregon Park officer has a Glock 17 in "Let Your Hair Down". Captain Sean Renard uses the Glock 17 as his main sidearm as well. Soledad Marquesa (Jordi Caballaro) has one in "Three Coins in a Fuchsbau". Nick had switched his Glock 17 from a second to a third generation type starting from "Happily Ever Aftermath".
Heckler & Koch HK P30
A Heckler & Koch P30 was used by Thomas Woolsey in "Love Sick" before Renard disarmed him and used it to kill him and his cousin, Anton Krug.
Heckler & Koch P7M13
A stainless Heckler & Koch P7M13 was used by a Schakal named Ian Flynn in "Three Coins in a Fuchsbau".
A silenced Luger P08 is used by Verrat assassin and enforcer Edgar Waltz (Sebastian Roche) in "Cat and Mouse". Ian uses Edgar's silenced P08 in the same episode.
SIG P230
Soledad Marquesa loads up on a SIG-Sauer P230 in "Three Coins in a Fuchsbau".
Smith & Wesson 5906
A Smith & Wesson 5906 is used by Orson (Daniel Roebuck) in "The Three Bad Wolves" when he assassinates Hap as part of an ongoing family feud between Blutbads and Bauerschweins. It was also used initially with a suppressor mounted on the barrel. He was about to use it on a wounded Angelina when Nick disarmed Orson by taking the pistol away from him.
Walther PPK
A Walther PPK is used by an assassin and Ian Harmon in "Cat and Mouse".
Gilda Darner (Amy Gumenick) arms herself with a Smith & Wesson Model 19 revolver in "Bears will be Bears" after getting bail, taken from Rocky Babb's room.
Smith & Wesson Model 65
A Smith & Wesson Model 65 with a 3" barrel is used by Bernard Aidikkoff to kill himself before police can arrest him in "Happily Ever Aftermath".
Monroe (Silas Weir Mitchell) is armed with a double barrel-based Elephant Gun in "Game Ogre" in order to defeat the ogre before he could kill Hank.
Mossberg 500
A Mossberg 500 with black plastic furniture was used by Orson when he confronted Monroe in his house in "The Three Bad Wolves".
Remington 870
A Remington 870 with black synthetic furniture was used by Hank in "Game Ogre". Captain Sean Renard uses one in "Organ Grinder" when he leads a Portland Police squad to secure a crime scene.
Remington 870 with Pistol Grip
A sawed off Remington 870 with pistol grip is seen in "Three Coins in a Fuchsbau".
Remington 870 Folding Stock
A Remington 870 with a folding stock and a shotgun shell holder was used by Hank to guard his house in "Woman in Black". The pumping mechanism appears to have black synthetic furniture in place of the original wooden furniture.
Assault Rifles
Colt M4A1
A DEA officer in "Let Your Hair Down" walks by with a Colt M4A1. Portland Police Special Emergency Response Team (SERT) officers are armed with the M4A1 in "Game Ogre" when they raiding the apartment of a suspect.
Sniper Rifles
Ruger M77 Gunsite
A Ruger M77 Gunsite is seen in the interior of a pickup in "Let Your Hair Down".
Steyr Scout
Seen in the interior of a pickup in "Let Your Hair Down".
Unknown
Others
Doppelarmbrust
Used by Nick and wielded by Monroe briefly in "Leave it to the Beavers". Nick uses it again in "Woman in Black". Akira Kimura tries to grab one before being disarmed in the same episode.